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砷是一种对人体有害的元素。食盐中砷的含量是国家食品卫生标准中的重要指标之一。目前常用的测定砷的方法有DDC—Ag盐法、砷斑法及氢化物发生原子吸收分光光度法。上述方法费时、操作较繁。用石墨炉原子吸收分光光度法直接测定砷具有快速、灵敏及适合常规分析的优点。然而在石墨炉原子吸收分光光度法中,测定食盐中的砷会遇到氯化钠的基体干扰。单孝全等用钯作基体改进剂测定了经消解的底泥、粉煤和生物材料中的砷,
Arsenic is a harmful element of the human body. The content of arsenic in the salt is one of the important indicators in the national food hygiene standard. At present, commonly used methods for the determination of arsenic include DDC-Ag salt method, arsenite method and hydride generation atomic absorption spectrophotometry. The above method is time-consuming and complicated to operate. Direct determination of arsenic using graphite furnace atomic absorption spectrophotometry has the advantages of being fast, sensitive and suitable for routine analysis. However, in graphite furnace atomic absorption spectrophotometry, determination of arsenic in table salt may encounter matrix interference of sodium chloride. Single and so on with palladium as a matrix modifier measured digested sediment, pulverized coal and biological materials in arsenic,